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Finding the Fourth Proportional to 765.99, 1,148.94 and 218.12

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Solution

The fourth proportional to 765.99, 1,148.94 and 218.12 is: 327.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.99 : 1,148.94 = 218.12 : x
  2. Step 2: Convert to fraction form
    765.99/1,148.94 = 218.12/x
  3. Step 3: Cross multiply
    765.99x = 1,148.94 × 218.12
  4. Step 4: Simplify right side
    765.99x = 250,601.05
  5. Step 5: Solve for x
    x = 250,601.05/765.99
  6. Step 6: Final answer
    x = 327.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.